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Preferred time/date format string (Sat Apr 07, 11:04 PM):

%a %b %d, %I:%M %p

To change virtual console (tty) font:

sudo dpkg-reconfigure console-setup   src: Ubuntu Forums thread #456968

Disable console beeps:

Open /etc/inputrc (or ~/.inputrc and uncomment or add:

set bell-style none

To have muliple tab completion options displayed should any exist (i.e.: .bashrc and .bash_aliases for .bash + TAB):

Open /etc/inputrc (or ~/.inputrc and add:

set show-all-if-ambiguous on

Refresh font cache:

# fc-cache -f -v

Set default applications by MIME type:

nano ~/.local/share/applications/defaults.list

Set Gnome-Terminal geometry:

nano /usr/share/vte/termcap/xterm modify, :co#null:it#8:li#null:\   src: http://forums.fedoraforum.org/showthread.php?t=45607

To change GDM font size:

/usr/share/gdm/themes/login-theme-name.xml   src: Ubuntu Forums thread #23048

To enable NumLock in GDM:

In /etc/gdm/Init/Default, add the following lines before exit 0:

if [ -x /usr/bin/numlockx ]; then
  /usr/bin/numlockx on
fi

To enable NumLock for virtual consoles (TTYs):

Add the following to /etc/rc.local

# Turn Numlock on for the TTYs:
for tty in /dev/tty[1-6]; do
    /usr/bin/setleds -D +num < $tty
done

To change the default cursor theme:

update-alternatives --config x-cursor-theme

.Xdefaults / .Xresources for xterm:

Xft.dpi: 96
Xft.antialias: true
Xft.hinting: true

XTerm*dynamicColors: true
XTerm*geometry: 140x25
! SET SIZE AND POSITION
!XTerm*geometry: 140x25+150+50
XTerm*toolBar: false
XTerm*utf8 : 1
!XTerm*faceName: terminus:pixelsize=9
XTerm*faceName: Inconsolata
XTerm*faceSize: 11
XTerm.cursorBlink: true
XTerm.foreground: #00FF00
XTerm.background: #000000


To disble update-apt-xapian-index*:

sudo chmod 644 /etc/cron.weekly/apt-xapian-index * included in Knowledge Base

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extract a .deb:

ar -x some_package.deb

create a .deb:

dpkg -b directory_with_req_files some_package.deb

create a .tar.gz:

tar -cvfz name_of_your_archive.tar.gz /path/to/directory

extract tar.gz files:

tar -xvzf

extract tar.bz2 files:

tar -xvjf

reload (source) ~/.Xresources:

xrdb -merge ~/.Xresources

reload (source) ~/.bashrc:

source ~/.bashrc

To find the 10 biggest folders in your current working path:

du -x --block-size=1024K | sort -nr | head -10   src: Linux Reviews > Tips and Tricks >

list the 10 packages that use the most disk space:

dpkg-query --show --showformat='${Package;-50}\t${Installed-Size}\n' | sort -k 2 -n | grep -v deinstall | awk '{printf "%.3f MB \t %s\n", $2/(1024), $1}' | tail -n 10

list last 30 files from newest to oldest:

ls -t | head -n 30

to erase a block device using dd utility:

export DISK=/dev/BlockDevice
sudo dd if=/dev/zero of=/${DISK} bs=1M count=16

fstab entry for fat32 device:

/dev/sda13  /media/sda13  vfat  user,umask=000,fmask=111,dmask=000,codepage=850,iocharset=iso8859-1 0 0

fstab entry for NTFS:

/dev/sda2 /mnt/windows7 ntfs-3g defaults,locale=en_US.utf8 0 0

fstab entry for nfs share:

192.168.1.111:/mnt/data_sda13 /home/dave/192.168.1.111_data_sda13 nfs noauto

to export / update nfs shares:

sudo exportfs -ra

to get device UUIDs:

ls -l /dev/disk/by-uuid

To check and repair file systems:

fsck

To check for inode size:

# tune2fs -l /dev/sda | grep -i "inode size"

Format an ext2 or ext3 partition with a specific inode size:

# mkfs.ext3 -I 128 /dev/xxx

Change ext2-4 label:

sudo tune2fs -L NewLabel /dev/DeviceName   src: Ubuntu Forums thread #302750

Format usb key to FAT 32:

mkdosfs -F 32 -I /dev/[device]
sudo mkfs.vfat -n multiboot /dev/sdX1

Change FAT 32 label:

sudo mlabel -i [device] ::[label] sudo mlabel -i ::

LAN IPs:

PC	IP Address
HP	192.168.1.111
Dell	192.168.1.113
Toshiba A200 (dad's)	192.168.1.117

Connection Information:

TCP/IP Entity	IP Address
Default Route / Gateway	192.168.1.1
Broadcast Address	192.168.1.255
Subnet Mask	255.255.255.0
Primary DNS	216.104.96.18
Secondary DNS	216.104.96.19
Domain	cpe.persona.ca

Take screenshot of a selected window, 3-second delay:

scrot -s -c -d 3

Show battery status, thermal and other ACPI information

acpi -V

To get DPI setting:

xdpyinfo | grep dots

Install software in Firefox using apt:

apt://packagename   src: http://linuxowns.wordpress.com/

Control CPU load by using ALSA hardware directly and bypassing software layer:

mpg123 --title -a hw:0,0 myfile.mp3

Random playlist playing on mplayer:

mq -shuffle -playlist mp3s.m3u

/etc/mpd.conf on client pc:

music_directory "/home/dave/media/mp3s/"
playlist_directory "/var/lib/mpd/playlists"
db_file "/var/lib/mpd/db"
log_file "/var/log/mpd/mpd.log"
error_file "/var/log/mpd/mpd.error"
pid_file "/var/run/mpd/mpd.pid"
state_file "/var/lib/mpd/mpdstate"
user "mpd"
bind_to_address "127.0.0.1"
port "6600"


To get mpd going:

mpd --create-db
mpc add /
mpc play
  src: Music Player Daemon Wiki - Getting Started

Watch .rars without unpacking/extracting:

unrar p -inul /example/path/to/Some.Scene.Release/some.sr.r00 | vlc   src: Ubuntu Unleashed

password-less ssh login:

ssh-keygen -f ~/.ssh/id_rsa -t rsa
ssh-copy-id <username>@<host>

Mount a remote file system with sshfs:

sshfs $USER@$HOST_IP:/path_to/remote_resource /path_to/local_mountpoint

to setup a simple Python HTTP server for file sharing, type the following from the target directory:

python -m SimpleHTTPServer 9914 from a web browser, use: http://$HOST_IP 192.168.1.1:9914.   src: linux.byexamples.com

Download torrent using aria2c:

location_of.torrent --dir=path/to/download/folder/
/home/dave/tmp/Fedora-12-i686-Live-LXDE.torrent --dir=/home/dave/Téléchargements/ --log=aria2.work.log

Show LAN traffic using tcptrack:

sudo tcptrack -i wlan0

Set wireless transfer rate:

iwconfig wlan0 rate 54M

Check open ports:

netstat -tupan | grep LISTEN

To open a port:

sudo iptables -A INPUT -p tcp --dport 6881 -j ACCEPT

Get external IP:

wget www.whatismyip.com/automation/n09230945.asp -O - -q

	320×200	640×400	640×480	800×600	896×672	1024×640	1024×768	1152×720	1280×1024	1440×900	1600×1200
4 bit				770			772		774
8 bit		768	769	771	815	874	773	869	775	864	796
15-bit	781	801	784	787	816	875	790	870	793	865	797
16-bit	782	802	785	788	817	876	791	871	794	866	798
24-bit	783	803	786	789	818	877	792	872	795	867	799
32-bit		804	809	814	819	878	824	873	829	868	834

  src: http://www.gentoo-wiki.info/Framebuffer

How to restore from dd:

# dd count=1 bs=512 if=/dev/zero of=/dev/sdx && sync

Ubuntu Chromium Daily Builds Repository:

deb http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/chromium-daily/ppa/ubuntu karmic main

Ubuntu Chromium Daily Builds GPG Key:

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 4E5E17B5

To create a group:

# groupadd group

To add an existing user to an existing group:

# usermod -a -G group_name user_name

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